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1 <br /> ' 12 May 2004 <br /> i AGE-NC Project No 97-0351 <br /> ' Page 2 of 4 <br /> EPA-approved volatile organic analysis(VOA) vials containing 0 5 ml hydrochloric acid(18%) as <br /> ' a sample preservative The samples were properly labeled, placed in a chilled container and <br /> transported under chain-of-custody to Cal Tech Environmental Laboratories (CTEL), a California <br /> Department of Health Services-certified laboratory Each sample was analyzed in accordance with <br /> • EPA Method 8015-modified for total petroleum hydrocarbons quantified as gasoline <br /> ' (TPI -g), <br /> • EPA Method 8260 for benzene, toluene, ethylbenzene and total xylenes (BTEX), methyl <br /> tertiary butyl ether(MTBE), and <br /> ' • EPA Method 826013-modified for the fuel additives di-isopropyl ether(DIPE), ethyl tertiary <br /> butyl ether(ETBE),methyl tertiarybutyl ether(MTBE),tertiary amyl methyl ether(TAME), <br /> ' tertiary butyl alcohol(TBA), 1,2-dichloroethane(1,2-DCA)and ethylene dibromide(EDB) <br /> ' 3.0. FINDINGS <br /> ' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 27 January 2004 The contaminant impact to ground water was quantified from the ground water <br /> laboratory data <br /> 1 <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> ' The relative elevation of ground water in each well was calculated by subtracting the ground water <br /> depth from the relative casing elevation The wells were surveyed relative to the top of well MW-1, <br /> ' which was assigned an arbitrary elevation of 10 feet <br /> Depths to ground water ranged between 8 21 and 9 49 feet,below the top of the casings Relative <br /> ' ground water elevations at the site ranged between 0 97 (MW-3)to 1 15 feet(MW-2) The relative <br /> ground water elevation data is summarized in Table 1 <br /> ' Ground water flow direction in the area of the western UST was inferred to be to the northeast at a <br /> gradient of approximately 0 002 (ft/ft) Ground water contours are depicted on Figure 3 <br /> 1 <br /> 1 <br /> ' Advanced GeoEnvironmental,Inc <br /> 1 <br />